Square-hole drill.



C. F. H AT HAWAY. SQUARE HOLE DRILL. APPLICATION FILED AUG-13. 1914,

R l m J d. m 3| P To all whom it may concern.-

UNITED STATES PATENT OFFICE.

CHARLES F. HA'IHAWAY, OF YORK, Y., ASSIGNOR '10 ANGULAR DRILL AND MACHINE CORPORATION, OFBO'CHESTER, NEW YORK, A COB.I OIR.A.'.I.ION OF NEW YORK.

. Specification of Letters Patent.

sedans-now DRILL.

I Patented Jan. 16, 191?.

Application filed August 13, 1914. Serial No. 856,537.

Be it known that I, CHARLES F. HATH- AWAY, a citizen of the United States of America, and a resident of New York, county and State of New York, have invented certain new. and useful Improvements in Square-Hole Drills, of which the following is a specification, reference being had to the accompanying drawing, forming a part thereof.

My invention relates to improvements in I square hole drills and its object is to provide 'a simple mechanism-which may be readily applied to a portable motor or to a machine tool and used to drill square holes.

Other objects and advantages will appear in the following specification in which I will describe my inventionand the novel features of which I will set forth in appended claims.

Referrin to the drawings: Figure 1 is an elevation o a square hole drill made in .accordance with this invention. Fig. 2 is an elevation partly in section of the same -ap-;

paratus. Figs. 3, 4 and '5 are sectional plan views of the apparatus shown in the pr'eceding figures, the sections being taken respectively on the lines 33, 4-4, and 5-5 of Fig. 2. Fig. 6'is an elevation of a modified construction of one of the parts ofthis device. A still further modification of this part is shown in elevation in Fig. 7. Like characters of reference designate corre- 'sponding parts in all the figures.

10 designates a part of a portable electric motor which is provided with a rotary socket 11. 12 is a spindle which is arranged to fit into the socket 11 and to-be driven thereby. The lower end of this spindle is threaded as at 13 to receive and support the upper end 14 of a circular guidesupportin housing 15. This housing and its upper en are connected by two post's16 which are parallel withthe axis of the spindle 12.

The drill guide. is designated by the numeral 20. It is constructed with a longitudinal opening 21 which is square in crosssection. The upper end of the guide is pro vided with an annularcollar-22 in the periphery of which is a groove 23 into which project the ends of set screws 17 which pass through housing 15. As the guide 20 is stationary in relation to the rota housing 15,

I prefer tointerpose between t e upper sur- 1 vice before specifically. fications shown-in the other figures'of the drawings. The apparatus is held securely face of the guide collar 22 and the adjacent under surface of the housing, roller bearings 18.

30 is a clamp bracket which surrounds the guide 20 and slides longitudinally over 1t.

This bracket is provided with a key 31' whichv fits in a key-way 24 in the guide. A set screw 32 passes through the clam bracket into a slot 25 which is cut in the si e of the guide 20 opposite the key-way but which does not extend to the lower end of the uide so that this set screw limits the longitudinal movement of the clamp bracket over the guide in one direction. A compression spring 26 is interposed between the upper end of the clamp bracket and the collar 22 of the guide. a

To-the lower end of the clamp bracket is afiixed a gripping jaw 33, the under surface of which may be serrated as shown and arranged to grip or engage the object to be drilled which in Fig. 1 is arbitrarily shown as apiece of wood 34. This gripping jaw is shown as square with holes 35 provided therein through which nails, pins or screws may be inserted if desired to more firmly secure the clamp bracket to the objectto be drilled.

- The drill bit comprisesthree parts, the lower of which designated by 40, forms the three cutting surfaces; the intermediate part of which designated by 41 is substantlally triangular in cross-section with convex curved sides, as seen in Fig. 4; and the upper part ofwhich, 42, is a square shank.

in a floating yoke or tool holder 43 and is secured thereto by a set-screw 44. The yoke longer arms is sufficient clearance to permit lateralmovements of the yoke and the This upper shank fits into a socket formed drill bit relative to the axis of rotation. 'A v spring-47 may be provided in the yoke'to as- SlSt in holding the set screw 44 in place.

I will describe the o ration of this dezscribing the modiit. his will hold the clamp bracket and 4 such for example as a screw? 39 provided guide 20 stationary in relation to the object. The rotation of the spindle 12 will be imparted to the drill-bit through the posts 16 and the floating yoke43, and the end of thespindle will push the drill-bit against the action of. the spring 26 into the work.

' The intermediate vpart 41 of the drill-bit in conjunction'with the square hole 21 in guide 20 will cause the cutting end of the drill bit to have the required transverse movements in additionto its rotation to cause it to cut a square hole. This peculiar mechanical mov mentri not new with me but is well known in the art. The mechanism by means of which the drill bit is rotated and is at the same time permitted to have the transverse movements which are imparted to it by the triangular part ofits shank, and the square guide hole, I believe is new, and

, bracket is constructed with a plurality of stepped shoulders 36 which may be made to engage the edge of a door or structure of similar shape when it is desired to cut a square hole in it, or a mortise by drilling a plurality of alining and intercommunicatmg holes.

The clamp bracket 30 shown in Fig.

, may be used similarly. --This one comprises a clutch member 37 screwed onto the end of the bracket 30 and two jaws 38 which may be adjusted by some suitable mechanism with right and' left-hand threads respectively engaging similar threads in the parts of the jaws 38 which are within the member 37, I intend no limitations other than those imposed by the appended claims.

What I claim is:

i 1. A square hole drill comprising a rotary circular guide supporting housing, a nonrotary guide having an annular collar within the end portion of said housing, an antifrictional bearing between said collar and the housing, a pair of posts parallel with the axis of rotation, a hub from which said posts extend, a cutting tool extending through the guide and between said posts, and a floating yoke constructed with a socket arranged to receive. the end of the cutting tool and having arms loosely embracing opposite sides of the posts.

o 2. A square hole drill comprising a rotary circular gulde supporting housing, a nonrotary guide having an annular collar within the end portion of said housing, said collar beingconstructed with a peripheral groove, screws projecting laterally through said housing into saidgroove, an antifrictional bearing between said collar and the housing, a pair of posts parallel with the axis of rotation, a hub from which said posts extend, a spindle to which said hub is affixed, a cutting tool extending through the guide and between said posts up to and against the spindle, and a floating yoke constructed with a socket arranged to receive the end of the cutting tool and having bifurcated arms loosely embracing opposite sides of the posts.v

I 3. A square hole drill comprisinga rotary housing, a pair of posts extending from the housing parallel with'the axis of rotation, a non-rotary:-tool guide mounted onthe housing but arranged to permit the rotation thereof, said guide being provided with a longitudinal opening,a cutting tool projecting through the guide and a floating yoke constructed with a socket arranged to receive the end of the cutting tool and having bifurcated arms loosely embracing opposite sides of the posts.

4. A square hole drill comprising a rotary housing, a pair of posts extending from the housing parallel with the axis of rotation, a non-rotary guide connected with the housing, said guide being provided with alongitudinal opening, a cutting tool pro ecting through the guide, a floating yoke constructed with a socket to receive the end of the cutting tool and having arms loosely embracing the posts and a clamp bracket longitudinally movable in relation .to the guide.

5. A square hole drill comprising a rotary housing, a pair of posts extending from the housing parallel with the axis of rotation, a

non-rotary guide connected with the housing, said guide. being provided with a longitudinal opening of square cross-sect1on, an anti-friction bearing between the hous ng and the guide, a cutting tool pro ecting through the guide, a floating yoke constructed with a socket to receive the end of the cutting tool and having arms loosely embracing the posts and a clamp bracket longitudinally movable in relation to the guide, said clamp brackethaving grrpping means for engaging the object to be drilled.

6. A square hole drill comprising a rotary housing, a pair of posts extending from the housing parallel with the axis of rotation, a non-rotary guide connected with the'housing, said guide being provided with a longitudinal opening of square cross-section, an anti-friction bearing between the housing and the guide, a cutting tool projecting through the guide, a floating yoke constructed with a socket to receive the end of the cutting tool and having arms loosely embracing the posts, a clamp bracket surrounding and arranged to slide over the guide, a

emma spring between a part of the guide and the clamp bracket, and a gripping device on the clamp bracket. a 7. A square hole drill mechanism comprising: a rotatable member adapted to be driven," a' tool guide and work holder mounted on and supported by the rotatable .be held stationary by engagement with the work and to hold the tool guide against rotation, and a floating tool holder connected to be driven by said rotatable member, said rotatable member being adapted to rotate independently of the tool guide.

9. A square hole drill mechanism comprising a rotatable member, a non-rotary tool guide mounted on and supported by the rotatable member, a work holder slidably mounted on the tool guide andladapted to be held against rotation by engagement with the work, means for preventing the separation of the work holder from said guide, and a spring pressing the work holder outwardly; and a floating tool holder connected to be driven by the rotatable member.

10. A portable square hole drilling mechanism comprising a rotatable member adapted to be driven, a non-rotary tool guide mounted on and supported by the rotatable member, and a work holder slidably connected to the tool guide and adapted to engage the work to prevent lateral or rotative movement of the tool guide.

11. A portable square hole drilling mechanism'comprising a rotatable member, a driving motor therefor, a non-rotary tool guide mounted on and supported by the rotatable member, and a work holder slidably connected to the tool guide and adapted to be -aflixed to the work to support the drill mechanism and to hold the tool guide stationary. Y

In nvitness whereof, I have hereunto set my hand in the presence of two subscribing witnesses, this 12th day of August, 1914.

F. GRAVES, ERNEST W. MARSHALL. 

